Rework of provider/designate to address current problems

[chrigl]

What would you like to be added:

I would propose a larger rework of provider/designate, because of the problems lined out below. Things are related very closely, so that it isn't particularly easy to address them one by the other, but rather come down to the same limitations in the code.

Why is this needed:

provider/designate has some problems at the moment.

• multiple targets are not supported in the way they should, there is still a workaround for pre-multiple-targets in place
• policy=sync does not work with registry=txt, addressed in External DNS does not delete records using Openstack Designate #1122 and fix: designate - add record fetching for txt records to delete and update #2797
• Doesn't work at all when migrating to new registry-format, see Additional Record Type TXT records can not be applied due to length #2790 (comment)

[chrigl]

/assign @chrigl

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/lifecycle stale

[k8s-triage-robot]

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/lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

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